Understanding Radiation Emission and Detection Setup
This exercise involves rearranging sentences to explain the change in count rate recorded by a Geiger-Muller counter when a circuit is closed. Radiation emitted by a radioactive source passes through a magnetic field, causing deflection and influencing the count rate. The setup and the phenomenon of radiation detection are detailed through the rearranged sentences provided.
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Genre Exercise Rearranging sentences
ExerciseRearranging sentences The set-up as shown in the following figure is used to study radiation emitted by a radioactivity source. A radioactive source and Geiger-Muller counter are placed at position P and Q respectively. Thus, the radiation emitted from the source passes through the gap between a pair of coilsAand B. When switch S is open, the average rate recorded by GM counter is 1,000 counts per minute. When we close switch S, the rate recorded by GM counter decreases to 400 counts per minute. Explain the change of count rate.
Rearrange the following sentences to form a reasonable answer to the above question. On the other hand, radiation with negative charges emitted by the radioactive source passes through the magnetic field. It experiences an electromagnetic force and has a deflection. When switch S is open, the GM counter detects radiation emitted from the source. Thus, the average rate recorded by GM counter is 1,000 counts per minute. When we close switch S, the count rate recorded by GM counter decreases from 1,000 to 400 counts per minute. The reasons are as below. When the circuit is closed, current flows through coil A and B. Thus, magnetic field is formed between the pair of coils. Hence, GM counter cannot detect radiation and record only the background radiation, i.e. 400 counts per minute. 1 2 3 4 5
Suggested answer Content Language features When Structure When we close switch S, the count rate recorded by GM counter decreases from 1,000 to 400 counts per minute. The reasons are as below. When switch S is open, the GM counter detects radiation emitted from the source. Thus, the average rate recorded by GM counter is 1,000 counts per minute. Identification of phenomenon The reasons are as below. When Absence of factor Thus When the circuit is closed, current flows through coil A and B. Thus, magnetic field is formed between the pair of coils. When ES1 Thus On the other hand, radiation with negative charges emitted by the radioactive source passes through the magnetic field. It experiences an electromagnetic force and has a deflection. Hence, GM counter cannot detect radiation and record only the background radiation, i.e. 400 counts per minute. One the other hand Presen ce of Factor Es2 Hence Es3
